Among the high voltage 5V cathode materials with spinel structure, lithium nickel manganate (LiNi1-xMnxO4) has good stability. The actual discharge capacity of LiNi0.5Mn1.5O4 is about 140mA h/g, which is close to the theoretical capacity. The charge and discharge platform is about 4.7V. At the same time, LiNi0.5Mn1.5O4 is simple to synthesize and is one of the mainstream directions of cathode development.

The advantages of lithium nickel manganate are: 1) high voltage platform, about 4.7V, high energy density, about 90Wh/kg;2) no need to add precious metals such as cobalt, low cost. The disadvantages are: 1) during the reaction process, manganese will be dissolved in the electrolyte and deposited on the surface of the negative electrode after disproportionation reaction, thus causing the SEI film to continue to consume and regenerate, consuming active lithium and reducing the cycle life; 2) high voltage will cause the regular electrolyte system to decompose, thus generating hydrofluoric acid to corrode the positive electrode material. At present, lithium nickel manganate mainly improves its comprehensive performance by ion doping, surface coating and material compounding.

Industrialization process: The NMx cobalt-free battery launched by Honeycomb Energy is equipped with lithium nickel manganate material, and its battery pack energy density can exceed 240Wh/kg, which is not much different from the low and medium nickel ternary battery.